Fallacy
Fallacy noun - A false idea or belief.
Usage example: the once-common fallacy that girls just weren't any good at math
Illusion is a synonym for fallacy in error topic. In some cases you can use "Illusion" instead a noun "Fallacy", when it comes to topics like delusion, misconception, falseness. popular alternative
Illusion
Illusion noun - A false idea or belief.
Usage example: the idea that we as a nation can ever enjoy perfect security is an illusion
Fallacy is a synonym for illusion in delusion topic. You can use "Fallacy" instead a noun "Illusion", if it concerns topics such as falseness, false belief, false impression. popular alternative
Mutual synonyms
Related pairs
How words are described
| common | common fallacy | common illusion |
| personal | personal fallacy | personal illusion |
| mental | mental fallacy | mental illusion |
| well-known | well-known fallacy | well-known illusion |
| Other adjectives: giant. | ||
Cite this Source
Illusion and Fallacy. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fallacy/illusion
Fallacy & Illusion. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fallacy/illusion>.
Illusion or Fallacy. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fallacy/illusion.
Google Ngram Viewer shows how "fallacy" and "illusion" have occurred on timeline